Furnace.



No. 782,472.. A g PATENTED FEB. A14:,A 1905!` E. W. TUCKER & G. L.GRUNDBLL.

FURNAGB. APPLICATION FILED MA1/2.30. 1903. RENBWED JUNE 20,1904.

Patented February 14, 1905.

PATENT OFFICE..

EDWIN W. TUCKER AND CHARLES L. GRUNDELL, OF SAN FRANCISCO, CALIFORNIA.

FURNACE.

SPECIFICATION forming' part of Letters Patent No. 782,472, datedFebruary 14, 1905. Application led March 30, 1903. Renewed June 20,1904,. Serial No. 213,413.

To ad whom, it may concern:

Be itknown that we, EDWIN W. TUCKER, residing at 818 Page street, andCHARLES L. GRUNDELL, residing at 1638 Hyde street, in the city of SanFrancisco, county of San Francisco, and State of California, citizens ofthe useful Improvements in Furnaces;

hcrebydeclare the following to be a full, clear,

and exact description of said invention, such as will enable othersskilled in the art to whichl it most nearly appertains to make, use, andpractice the same.

This invention relates to improvements in furnaces, and particularly tothe adaptation of the furnaces of Water-tube and all externally-firedboilers -to the use of liquid fuel.

Because of the circulation of water around and about the furnaces ofmost water-tube boilers the furnace heat is rapidly absorbed,

. rendering the boiler very sensitive to thermal iiuctuations. Theprincipal source of trouble tion and reaction of heat with anl intensitycapable in a measure of withstanding the cold drafts, whereas injectedoil, giving a sublimated fiame of high velocity and suction, must beprotected against inrushes of cold walls and surface of the furnace andmixing with the flame reduce the absorbent power of the former andweaken the latter.

The objects of this invention are to overcome the objections above setforth by controlling the inlet of cold air and warming it beforeadmission to the combustion-chamber and to accomplish heating of the airby refraction of heat within the combustion-chamber.

In carrying out our invention We provide hollow superheating-chambersfixed Within the front of the furnace in place of the usual Va solidflooring of rushing into the furnace-space` thereto.

Stoke-doors and extend.

through .which the burners The usual grate-bars are replaced bylire-brick having a narrow opening constituting the dead-rise across thefront under the burners. Dampers are arranged whereby the inlet of airthrough the dead-rise is controlled from the outside. Adefiecting-diaphragm is disposed across the width of the furnace betweenthe lioor of the combustion-chamber and the floor. of the ashpit. Theinlet of air through the lower dam- 'per-opening is controlled by ladoor horizontally hinged at its bottom, whereby the ingress of air isdirected against the deliectingdiaphragm when the door is partiallyopen. When the said door is wide open, the draft is controlled 'by aseries of horizontally-pivoted slats or defiectors operated in unison,wherebythe current of air may be deflected at any desired angle. Ininternally fired boilers (marine type) the deflectors can be fixed inthe opening at a definite angle.

In the drawings, Figure l is a vertical crosssection on the line X X,Fig. 2, of a watertube boiler having this invention adapted Fig. 2 is afront elevation of furnace-fronts thereof.

In detail the construction consists ofthe hollow superheaters A, aroundand through which the vehicle of atomization' (compressed passing to theburners B. The superheaters A, situated in the front of the furnace,absorb the heat radiating therefrom and return it through the flameissuing from the burners. The combustiou-chamber is formed by the shellor tubes of the boiler (according to the type) above, bridge-wall rc atthe rear, the usual brick or tubular sides x2, the superheatingfronts A,and the Hoor. The fioor consists of the sheet-iron base C, suitablysupported and having a layer of fire-brick C laid thereon, with athickness of asbestos millboard C2 between to protect the iron from theintense heat of the combustion-chamber. The airthe floor near thefurnace-fron t. the dead-rise is controlled by the 1 2 Y 5 1ated at D toreceive a pin engaging the 1 0 the demand of the stack-suction.

f' `gof this invention. Therefore the space'below l5 This isaccomplished by closing the rear of 2O above the damper-door downward tonear the ter, consisting of a series of horizontal deor close in unisonwith the action of the rod quadrant F5.

the current of air curls around the air passes directly into the flameof the air are eliminated and a certain amount of re- 'theboiler-surface as it passes.

the shutters F. It will also be observed that the angle at which the airenters is controlled by the shutters independent of the angle of thedoors G.

The type of superheater furnace-front and also the type of burnersconstitute separate applications for patent and are not herein claimed.

It is obvious that this invention relates to other types of boilers, andapplicants do not wish to be confined to the exact type illustrated inits interpretation.

Having thus described this invention, what is claimed, and desired tosecure by Letters Patent, is-

1. lIn combination with a steam-generating boiler, a furnace adapted tothe use of fueloil, having hollow superheating chambers through whichthe vehicle of atomization circulates before admission to the burners, asolid iioor having a draft-opening at its front, dampers arranged tocontrol the volume of air passing through said opening, a closedair-space being formed beneath' said floor, a diaphragm dividing saidspace horizontally, openings being formed in the front below saiddiaphragm, hinged doors arranged to regulate the volume of air enteringsaid opening, and a series of shutters or defiectors arranged in saidopenings and adapted to regulate the angle at which the air enters.

2. In combination with a steam-generating boiler, a furnace adapted tothe use of fueloil having a solid floor provided with draftopeningsacross its front, dampers arranged to close said openings, means foradjusting said dampers with relation to said openings and holding themin their adjusted position, a closed air-space being formed beneath saidfloor, a diaphragm dividing said space horizontally, openings beingalsoformed in the front below said diaphragm, hinged doors arranged toregulate the volume of air entering said openings, and a series ofshutters or deectors mounted in said opening and adapted to regulate theangle at which the air enters, and means for holding said shutters ordeiiectors in any adjusted position. l

3. Afm-nace adapted to the use of fuel-oil having a draft-opening, aswinging door adapted to regulate the volume of air entering saidopening, a series of shutters or deiiectors mounted in said opening andadjustable to regulate the angle at which the air enters said opening,and means for holding said shutters or deflectors in any adjustedposition.

In testimony whereof we have hereunto set our hands this 23d day ofMarch, 1903.

EDWIN W. TUCKER. CHARLES L. GRUNDELL. Witnesses:

BALDWIN VALE, Gno. F. HA'rToN.

pivoted adjacent to the edge of the opening and controlled by the handleD, projecting through the face-plate of the furnace.- To control thesaid damper, the handle is perfoquadrant D3, provided withperforationsinto which the pin may be inserted to fix the damper at thedesired angle. As described, the dead-rise is the only inlet for air tosupply To admit cold air at this point would defeat the objects the oorof the combustionchamber 1s utilized as a heating zone for the incomingdraft.

this space with the vertical wall E under the bridge wall. The heatingchamber thus formed is divided horizontally by the sheetiron diaphramE', extending from the front.

center and terminating short of the rear wall E to leave a rise for thedraft.

The volume of incoming air is controlled and directed by the doors G anddivided shutflectors or shutters pivoted at each end on the sides of thedamper-opening. The shutters F are connected by thevertical rod F insuch a manner that the shutters are caused to open which is controlledby the lever F2, hinged at F3 and fulcrumed to the rod at Ff. rlheposition of the lever F2 is fixed by apin extending through the same andthe perforated The incoming air receives its preliminary heating bybeing directed by the shutters F and doors G against the diaphragm E',which is heated by the heat radiated beneath the floor C. Following thediaphragm the lower end into the intense heat existing between the oor Cand the diaphragm and enters the combustion-chamber through the openingC3 at ahigh temperature. From the opening C burners, mixing therewith,to be carried forward and distributed lto the heating-surface of theboiler. By thus making a pocket of the combustionchamberdisturbing-currents of generative action created thereby, whereas whereopen grate-bars and direct ventilation exists the excess of cold air,which is beyond control, rushes up the smoke-stack, chilling By thisar-v rangement of dampers a reserve of hot air can be bankedin the spacebelow the oor C by opening the shutters F and doors G and restrictingthe openings C3 by the dampers It will be noted that when the doors Gare partly open they serve to direct the air against the diaphragm; butwhen said doors are open to their fullest extent the -air is deflectedby IOO IOS

